Which of the following pairs of cations can be separated by using on adding NaOH solution?

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Problem

Which of the following pairs of cations can be separated by using on adding NaOH solution? (1)

\text{Cu}^{2+}

\text{Zn}^{2+}

(2)

\text{Pb}^{2+}

\text{Al}^{3+}

(3)

\text{Sn}^{2+}

\text{Pb}^{2+}

(4)

\text{Zn}^{2+}

\text{Pb}^{2+}